Before a problem can be solved, it must be obvious ________the problem itself is.(2011·湖南)
A.whatB.thatC.whichD.why
A
A [考查主語從句。從句中缺表語,排除B和D;又因題目沒有給出problem的范圍,故選A。句意:在解決問題之前,一定要弄清楚問題是什么。]
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